UNHAPPY WITH VODACOM CONTRACT!!!!

I did not expect to be complaining again so soon. I have been frank with Vodacom that I am not enjoying my cellphone contract with them. My contract with them started on 26 January 2019. I was losing airtime without any explanation , anyway, after much noise my airtime was refunded. There is always one issue after another. Fast forward to 3 months later... I'm now complaining about the amount that was debited from my account on 25 April 2019. They have taken R129.40 more than what was agreed on. I called on Friday the 18th of April 2019, 7 days before the date when the amount would be debited. I was was told I have 2 insurances of which i only know about one. I told to the guy that I only have one insurance and do not recall taking up second insurance. He said he would escalate the matter and would get back to me. I was given 2 reference numbers via SMS, informing me that my query had been escalated. The 25th came, and the second insurance amount was taken. I called , and was told I had to wait 7 working days after the query for feedback and that I would get my resolution on the Monday the 29th of April 2019. To date ( 03.05.2019) no resolution or feedback has been given. I have to keep calling them and not really getting a clear story. I have also complained on Twitter and was asked for a reference number, thereafter I was told that they would have a look at the matter. Still no response. I'm really unhappy with my contract with Vodacom . Their rates and data are too expensive, and if I knew before, I would not have taken a contract with them.